Spiders of North Carolina

Arachnids of North Carolina

Order:
Scientific Name: Common Name:		Family (Alpha):

Crosbycus dasycnemus - No Common Name Taracidae Members:			NC Records	BugGuide Account	Public View

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Distribution Records
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Vetting Levels

Adult phenology:
High Mountains (HM) ≥ 4,000 ft.
Low Mountains (LM) < 4,000 ft.
Piedmont (Pd)
Coastal Plain (CP)

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synonym

taxonomic_comments

The sole member of this genus (Shear, 1986; Cokendolpher and Lee, 1993)

species_comment

id_comments

Only females are known and the species is believed to be parthenogenic (Shear, 1986). The sclerotized tergites are dark brown, contrasting strongly with the pale, whitish connecting membrane between them. Black denticles cover large areas of both the cephalothorax and abdomen. Hesperonemastoma kepharti is similar in size and in the contrast between the dark sclerotized plates and whitish connecting membrane. That species is more blackish, however,

total_length

0.89 mm (Shear, 1986)

structural_features

The palps are extremely thin and about as long as the first and second pair of legs; the tibia and tarsus are covered with plumose setae and the terminal claw is absent (Shear, 1986). The femor, patella, and tibia of the walking legs are ornamented with large socketed setae, spines, and curly hairs.

silk_web

fld_guide_descriptions

online_photos

Photographs are included on BugGuide, but under the genus name

prey

Probably consists of mites, collembolans, and myriapods (Shear, 1986)

predators

behavior

distribution_reference

Banks (1911)

technical_reference

Shear (1986)

adult_id

1 identifiable by photo 2 identifiable by photo of specific features and/or supplementary info 3 identifiable from specimen only

abundance

Too few records exist to estimate either the frequency of occurrence or abundance of this species in North Carolna

distribution_comments

Probably found throughout the Mountains in appropriate habitats. This species is fairly widespread in the North, ranging from New England to the Great Lakes region. It ranges as far south as South Carolina in the Southern Appalachians (Shear, 1986).

checklist_mt_high
>=4,000 ft.

Regular	Frequent	Infrequent	Occasional	Seldom	Frequency Regular – almost always observed on given visit; >=90% chance of observation Frequent – usually observed on a given visit; >=50%<90% chance of observation Infrequent – observed less than 50% of visits; >=25%<50% chance of observation Occasional – observed on only on a small minority of visits; >=10%<25% chance of observation Seldom – not usually seen on visits; <10% chance of observation These terms refer to visits to appropriate habitats made at appropriate times of the year, making use of common sampling/observation methods. Under those conditions, Frequency refers to the chance of observing at least one individual on a given visit made anywhere within a particular region, or over multiple visits to a single site.

checklist_mt_low
<4,000 ft.

Regular	Frequent	Infrequent	Occasional	Seldom

checklist_pd
Piedmont

Regular	Frequent	Infrequent	Occasional	Seldom

checklist_cp
Coastal Plain

Regular	Frequent	Infrequent	Occasional	Seldom

habitat

This species is associated with cool, moist microclimates and appears to occur primarily in hardwood-dominated forests rather than stands of conifers; several specimens have been found in Rhododendron leaf litter (Shear, 1986). Records in North Carolina come from both high elevations (over 5,000 ft in some cases), as well as fairly low elevations, such as the Swannanoa River valley.

observation_methods

Usually collected using Berlese funnels (Shear, 1986)

state_protection

Arachnids are not protected under state law, although permits are needed to collect them in State Parks and other public and private nature preserves

NHP_ranks

[GNR] [S3S4]

NHP_status

status_comments

We have relatively few records for this species but that may be due to the specialized methods needed to collect this species. Although at least somewhat specialized in terms of its habitats, its habitats appear to be widespread within the Mountains. As a species associated with cool, moist microclimates, it is likely to be vulnerable to the warming and drying effects of climate change as well as disturbances that open up the forest canopy.

Photo Gallery for Crosbycus dasycnemus No common name
	Recorded by: Carol Tingley Avery Co. Comment:		Recorded by: Carol Tingley Avery Co. Comment:

Photo Gallery for Crosbycus dasycnemus No common name